Garage door fires up automatically
My old Craftsman Garage door opener (model #139.53615SR) is opening the door at odd times of the day and night by itself. I've changed the battery in the remote, but that hasn't stopped the problem. We have to lock the door now so if it fires up in the middle of the night it won't open, but of course every time we want to open it we have to manually unlock it first. Thought of changing the code on the remote and garage unit but can't find any switch panel in the unit iself or on the wall switch to do so, on the remote it's easy a panel slides away and I can change the dip switches easily. Can you help?